Best Celebrity Pictures of the Week

Stars and their kids had fun this week! Gwyneth Paltrow was out and about with Moses and Apple in London, and Brad Pitt spent quality time with his son Knox during a visit to Legoland not far away. George Clooney ventured to Houston ahead of his 51st birthday tomorrow, as Kristen Stewart made an appearance on Jimmy Kimmel Live. That's not all that went down — check out what the other stars were up to.